Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-43633

HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal
Back to all
CVE

CVE-2026-43633

HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with the web terminal feature enabled.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.5
-
4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43633.json, https://nvd.nist.gov/vuln/detail/CVE-2026-43633, https://www.vulncheck.com/advisories/hestiacp-deserialization-rce-via-web-terminal, https://github.com/hestiacp/hestiacp/issues/5229, https://github.com/hestiacp/hestiacp/pull/5244, https://github.com/hestiacp/hestiacp/commit/854d71b3c1737b0a0d0cc55c926008ffe1f6719b, https://github.com/hestiacp/hestiacp, https://mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.01072%
EPSS Percentile
0.62345%
Introduced Version
1708dd971fd1e9d49a5f9ead6d0ba103e15ac45c
Fix Available
854d71b3c1737b0a0d0cc55c926008ffe1f6719b

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading